Maths question

In the Binomial Expansion of (1+x) ^n (power n ).When n is greater or equal to 4 .The coefficient of x power 5 is 2 times the coefficient of x power 4 .Find the value of n

Reply 1

mqb2766

Original post by DrAwadhi

In the Binomial Expansion of (1+x) ^n (power n ).When n is greater or equal to 4 .The coefficient of x power 5 is 2 times the coefficient of x power 4 .Find the value of n

Just write the equation down as given and solve for n. So the coefficients are given by nCr ...

Note it helps to describe in the OP what youve tried/what problem youre having.

(edited 1 year ago)

Reply 2

DrAwadhi

Original post by mqb2766

Just write the equation down as given and solve for n. So the coefficients are given by nCr ...

Note it helps to describe in the OP what youve tried/what problem youre having.

Sorry I don’t how to share a picture in this website/app .Can you help if you know

Reply 3

mqb2766

Original post by DrAwadhi

Sorry I don’t how to share a picture in this website/app .Can you help if you know

You could just type the basic equations in or ...
But if you post an image on another site, just link it using the Insert Image icon in the reply toolbar.

Reply 4

Tom Mort

Reply 5

mqb2766

Original post by Tom Mort

n...

Best to read the posting guidelines sticky at the top of the forum about posting hints, not solutions. Thanks.

(edited 1 year ago)

Reply 6

Tom Mort

Original post by mqb2766

Best to read the posting guidelines sticky at the top of the forum about posting hints, not solutions. Thanks.

sorry ill delete it

Reply 7

DrAwadhi

Thank you all 🙏,Be blessed

Reply 8

CONGO Ousmane

Ln 2

Reply 9

DrAwadhi

Original post by CONGO Ousmane

Ln 2

🙄🙄

Reply 10

dheern_93

The answer is n=14

(edited 1 year ago)

Reply 11

DrAwadhi

Can I have your solution how you calculate

Reply 12

dheern_93

Yes sure, we will have to do this repeatedly. I just put the values in the formula (1+ nx + n(n-1)/2!) you may try using this you will get 1001x power 4 and 2002x power 5.
If you still have a doubt you can let me know.